I heard this argument yesterday, what if the gay guy/gal refuses to take the hill because he/she thinks they're singled out for swiss cheese duty simply because they're gay.....but anyone could make the same case for virtually anything...."you're sending ME because I'm the only white, black, hispanic, married, single, left-handed, Jewish soldier in the platoon"....not sure that really holds up but if you "don't ask don't tell"...then.....at least one minority would be tougher to single out for swiss cheese duty
btw, I know plenty of very happy gay people...also know some that had a tough time growing up and are resentful for the way that they've been treated as a result of being gay, but this is not something that is unique to being gay....I knew a combat pilot who was gay and happy and very successful....